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POWER MANAGEMENT. The power created by a reciprocating engine is a product of MAP (manifold absolute pressure) and rpm.If rpm remains constant and MP is increased, power output will be increased.If MP remains constant and rpm is increased, power output will be increased.. FACTORS AFFECTING POWER. Humidity- water vapor in the air takes the place of oxygen molecules. The molecular weight of water vapor is less than oxygen; as a result moist air is less dense than dry air. Less dense air means de1140
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